Updated deprecated keystone_authtoken option

* memcache_servers is a deprecated name for memcached_servers.
  See: keystonemiddleware/auth_token/__init__.py#n287

NOTE: memcache_serves in the cache section is valid option for
    oslo.cache.  See oslo_cache/_opts.py#n65

Depends-on: Id65f1bff8e38c777fa406d88ac6a2355d6033d94
Change-Id: I3e1230b139e710a0433e71ce118ca246d7c6a0e6
diff --git a/lib/keystone b/lib/keystone
index 5ed7de9..47de2b7 100644
--- a/lib/keystone
+++ b/lib/keystone
@@ -484,7 +484,7 @@
     iniset $conf_file $section auth_uri $KEYSTONE_SERVICE_URI
     iniset $conf_file $section cafile $SSL_BUNDLE_FILE
     iniset $conf_file $section signing_dir $signing_dir
-    iniset $conf_file $section memcache_servers $SERVICE_HOST:11211
+    iniset $conf_file $section memcached_servers $SERVICE_HOST:11211
 }
 
 # init_keystone() - Initialize databases, etc.